A patient ALWAYS have a choice!!if u dont want an enama,then refuse:)gone is the days where u have to agree with everything.i can only speak about the hospitals where i worked:
An enema is a bit old fashioned.but a full rectum can prolong the head of baby to come down,therefor the use for it(most of the time)but if you did opened your bowels before coming to the hospital,then no need for it.
About the cathether,same principle.full bladder can also keep your babies head high.but if you can still walk to the toilet,no need for a catheter:)only time where you need a catheter is when you have epidural.since you are not mobile to walk to bathroom..